Heat Factory Premium Hand Warmers Pack of and long-lasting warmth for your body in cold outdoor activities Hand warmers fit inside gloves, pockets, beanie caps, and other Heat Factory accessories Simply open the outer package and expose the hand warmer packet to air for 10 hours of instant long-lasting heat Safe, non-toxic and odorless heat warmers are pre-mixed with a biodegradable mixture of iron powder, charcoal, salt and vermiculite Hand Warmers proudly made in the USA